Causes Of “Black Mold” Growth In Your Home (And How To Get Rid Of It)

Black Mold Growth South Carolina

Black Mold Removal Requires Professional Treatment

When we get calls for mold inspection and removal, homeowners usually ask about black mold. Black mold (stachybotrys) is a toxic fungus often associated with poor indoor air quality and water damage. Given the toxicity of the black mold, many have heard news stories about adverse health issues or warnings from public health agencies to contact a professional service like MasterTech of Myrtle Beach for removal.

The CDC recommends a mixture of soap and bleach to remove mold. But for larger jobs, or should mold return, MasterTech of Myrtle Beach provides full-service mold removal that includes a follow-up inspection to make sure the job was done correctly and all mold effectively killed and removed.

In this blog we’ll look at the conditions needed for black mold to grow, some of the most common causes of residential black mold growth in Myrtle Beach, and clear actions you can take to rid your home of it.

Black Mold Needs the Right Conditions to Thrive

For mold to grow, it needs the following conditions:

  • Food Source: black mold needs an organic food supply to live and grow. In this case, mold eats organic substances in wood, wallpaper, flooring, and other building materials. Since the “food” supply isn’t something you can get rid of, it’s important to control for the other conditions once mold is removed to prevent regrowth.
  • Moisture: black mold loves humidity, which is excess water in the air. For this reason, mold is often found in high moisture areas like bathrooms, basements, or attics with HVAC ducts.
  • Warm, Dark Place: most mold spores will die in extreme cold (although some can live in your freezer!), so a warm, dark place is ideal for growth. Under house storage areas, outdoor showers, and anywhere where light is low and temperatures are warm is prone to mold growth.

If black mold has all of the conditions above, it can grow and thrive rather quickly. You may even see mold spread in a couple days.

Common Causes of Black Mold Growth

But where did this mold come from and why is it happening all of a sudden? This is the question many Myrtle Beach homeowners ask. You may have not seen any mold and now an explosion of it. Why? Here are the most common causes of black mold growth:


HVAC Duct Condensation: Myrtle Beach is a hot and humid place in the summer, and most have a central AC running all the time during the hottest part of the year. The HVAC ductwork carries cooled air around your house, but it is also responsible for removing moisture. Trapped condensation or leaky ducts may create the moist, dark spaces needed for black mold to grow. These problems are sometimes discovered by an HVAC professional who may be inspecting for the source of inefficient home cooling. Ductwork cleaning or repair should happen alongside mold removal.


Slow Plumbing Leaks: the plumbing behind the toilet, under sinks, or below bathtubs is often hidden from view. Slow leaks dampen and soften floorings or cabinetry and become warm, dark places for mold growth to occur. If you see black mold around plumbing, it’s a good idea to investigate for slow leaks and repair them immediately in addition to taking care of the black mold.


Damage to Roof, Foundation, or Other Home Structure: Myrtle Beach experiences hurricanes, tropical storms, and flash flooding (and with it plenty of power outages). As a result, homes may see storm surging water that damages first floors, roofs, or seeps into other structural cracks. These are all potential areas for mold growth. Given that there are few basements in Myrtle Beach, basement black mold growth isn’t the concern that it is in other parts of the country. Should you experience home damage during a storm, we recommend working with a mold and water damage specialist like MasterTech of Myrtle Beach alongside a trusted residential contractor and home builder.

Get Rid of Black Mold with MasterTech of Myrtle Beach

Summer is here and that means high humidity in Myrtle Beach. Excess moisture in the air can also cause mold to develop. Don’t underestimate mold spores. In the right conditions they can be difficult to kill and harmful to your health–even deadly! MasterTech Environmental of Myrtle Beach offers mold inspection, testing, and removal services for homes and businesses.


We provide the safest, most effective mold removal services throughout Myrtle Beach and surrounding areas in South Carolina and North Carolina. Need more information about our services in your South Carolina area? Contact MasterTech with our online form or call us today: 843-236-3399.

Mold inspection in Myrtle Beach
By Jonathan Smith September 26, 2025
Schedule a professional mold inspection in Myrtle Beach and take back control of your air because protecting your family’s health and your home starts with finding what you can’t see.
By Jonathan Smith September 20, 2025
You smell something musty when the AC kicks on — is it coming from your attic? It’s unsettling when a wave of mustiness greets you every time your air-conditioning starts. The odor wafts from vents, yet looking around your living room reveals no visible problem. Eventually, you climb into the attic and find black and white patches on the roof decking and rafters. You may feel embarrassed for missing it, angry about the potential cost, and worried about what your family has been breathing. That mix of emotions is normal. Hidden attic mold often goes unnoticed because attics are rarely visited and because spores can travel quietly through ductwork. When mold establishes itself overhead, it isn’t just an eyesore; it becomes an air-quality issue for your entire home. Molds release spores whenever they are disturbed. An HVAC system that passes through or near a moldy attic can carry those spores into bedrooms and living spaces, exacerbating allergies and asthma. Any mold growth indoors indicates a moisture problem and needs to be addressed promptly. Attic mold remediation isn’t about cosmetic cleaning—it’s about eliminating a contamination source, fixing the underlying moisture and ventilation issues, and protecting your air ducts from becoming a delivery system for spores. How Attic Mold Enters Your Living Space Mold contamination in the attic rarely stays contained. The attic may be hidden above your head, but the pathways that connect it to your living space are surprisingly efficient. Airflow, ductwork, and even subtle pressure changes in your home can act as invisible highways, carrying spores downward where your family lives and breathes. Understanding these entry points shows why attic mold is more than an isolated issue; it’s a whole-house problem. Here are the most common ways attic mold infiltrates the rest of your home. · Supply and return ducts run through or near a moldy attic. Warm air traveling through cool, humid attic spaces can condense on ducts, creating wet spots where mold colonizes. Once mold grows on or near the ductwork, spores are easily pulled into the system and distributed to the rest of the house. · Negative pressure draws attic air downward. When bathroom fans or dryers operate, they can depressurize living areas, pulling attic air (and mold spores) into the house through small openings around light fixtures and access hatches. · Running a contaminated HVAC system spreads spores. If heating or cooling equipment is contaminated with mold, operating it can push spores throughout the building. Moisture and Ventilation Issues Are the Real Culprits It’s easy to blame mold itself for the problem, but mold is more of a symptom than a cause. The real enemy is moisture, and in the confined environment of an attic, even small amounts of dampness can create a breeding ground. Mold takes advantage of humidity, condensation, and leaks, thriving wherever water lingers longer than it should. Without addressing these underlying triggers, any cleanup is only temporary. The most common culprits behind attic mold include the following: · High humidity or inadequate ventilation. Warm, humid air trapped in an attic condenses on cooler surfaces. Blocked soffit vents, improperly vented bathroom fans, or missing ridge vents allow moisture to accumulate and keep attic lumber damp. · Roof or flashing leaks. Small leaks around chimneys, vents, or roofing materials provide direct moisture and can drip onto insulation and rafters unnoticed. · Poorly insulated ceilings or ducts. Temperature differences between conditioned living spaces and an unconditioned attic cause condensation on ductwork or the underside of roof sheathing, encouraging mold growth. · Long run times for undersized HVAC systems. Oversized fans running continuously re-evaporate water sitting on cooling coils and push moisture back into the attic and ducts. What Professional Attic Mold Remediation Does Differently DIY attempts often focus on surface-level fixes, such as bleach sprays or paint, but these solutions only mask the problem temporarily. Professional attic mold remediation is different because it treats the issue as a whole-house health hazard, not a cosmetic blemish. The process is carefully designed to protect your family during cleanup, remove contaminated materials thoroughly, and prevent mold from coming back. A trained remediation team follows a multi-step approach that includes: · Containment and protection of living areas. Professionals install physical barriers and negative-pressure units so that air flows into, not out of, the work area. This prevents spores from traveling to clean parts of the home. Simply painting over or covering mold is not an acceptable solution. · Removal and cleaning of contaminated materials. Technicians remove severely damaged insulation or duct sections, clean salvageable wood using HEPA-vacuuming and antimicrobial treatments, and may sand or dry-ice blast rough lumber to remove deep growth. · Addressing the root moisture problem. There is no lasting benefit to removal if humidity and leaks are not fixed. Professional remediators locate and repair roof leaks, correct ventilation deficiencies, insulate or encapsulate ductwork, and may recommend installing a dedicated dehumidifier. Attic Mold Remediation in Myrtle Beach: Protect Your Air Before It’s Too Late Mold in the attic is more than a hidden blemish; it’s a whole-house problem that contaminates your air every time the HVAC kicks on. We’ve seen how spores spread through ducts, how moisture and poor ventilation create the perfect breeding ground, and why surface-level fixes never last. Together, these factors turn a neglected attic into a serious health and structural hazard. The takeaway is simple: attic mold remediation isn’t optional or cosmetic — it’s essential. Professional containment, thorough removal, and moisture control protect your family’s health, preserve your home’s integrity, and prevent the cycle from repeating. So when that musty odor lingers, don’t dismiss it. It’s your home’s way of warning you. Act now, and secure cleaner air and a safer house with professional attic mold remediation.